Update system-api for new getLine1Number() method.

Add new method in TelecomManager to system-current.txt.

Bug: 19087382
Change-Id: Id6db61fed45301cc1a15ded6e362d7858f24a273
diff --git a/api/system-current.txt b/api/system-current.txt
index 39685ae..56edc72 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -30341,6 +30341,7 @@
     method public android.telecom.PhoneAccountHandle getConnectionManager();
     method public android.telecom.PhoneAccountHandle getDefaultOutgoingPhoneAccount(java.lang.String);
     method public android.content.ComponentName getDefaultPhoneApp();
+    method public java.lang.String getLine1Number(android.telecom.PhoneAccountHandle);
     method public android.telecom.PhoneAccount getPhoneAccount(android.telecom.PhoneAccountHandle);
     method public java.util.List<android.telecom.PhoneAccountHandle> getPhoneAccountsForPackage();
     method public java.util.List<android.telecom.PhoneAccountHandle> getPhoneAccountsSupportingScheme(java.lang.String);